/*
 * This file is part of ALVAR, A Library for Virtual and Augmented Reality.
 *
 * Copyright 2007-2012 VTT Technical Research Centre of Finland
 *
 * Contact: VTT Augmented Reality Team <alvar.info@vtt.fi>
 *          <http://www.vtt.fi/multimedia/alvar.html>
 *
 * ALVAR is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with ALVAR; if not, see
 * <http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html>.
 */

#include "Plugin_private.h"

#include "AlvarException.h"

#include <windows.h>
#include <sstream>

namespace alvar
{
class PluginPrivateData
{
public:
  PluginPrivateData() : mHandle(NULL)
  {
  }

  HINSTANCE mHandle;
};

PluginPrivate::PluginPrivate() : d(new PluginPrivateData())
{
}

PluginPrivate::~PluginPrivate()
{
  delete d;
}

void PluginPrivate::load(const std::string filename)
{
  d->mHandle = LoadLibrary(filename.data());
  if (!d->mHandle)
  {
    std::stringstream message;
    message << "could not load " << filename << ", error code "
            << GetLastError();
    throw AlvarException(message.str().data());
  }
}

void PluginPrivate::unload()
{
  FreeLibrary(d->mHandle);
}

void* PluginPrivate::resolve(const char* symbol)
{
  void* address = (void*)GetProcAddress(d->mHandle, symbol);
  if (!address)
  {
    std::stringstream message;
    message << "could not resolve " << symbol;
    throw AlvarException(message.str().data());
  }
  return address;
}

}  // namespace alvar
